Math

Use 3.14 for π. Round answers to the nearest hundredth if necessary.

The figure shows a circle with a point Upper X labeled at the center.

Calculate the area of Circle X if the diameter is 13 inches.

____ square inches

Calculate the radius of Circle X if the circumference is 138.16 square millimeters.

______millimeters

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  1. (a) recall that area = πr^2
    r = 13/2, so area = π * (13/2)^2

    (b) recall that C = 2πr
    2πr = 138.16, so r = 138.16 / 2π

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    oobleck
  2. Okie thanks!

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